Improvement in the manufacture of metal tubing



- CONVERSE. Manufacture ofMetal Tubing.

Patented May 28;1878.

flu at "a s a n 01 aim I N-IPETERS, PHOTOJ nuoeawuzn, wAsnm'arou, n. c.

UNITED STATES PATENT OFFICE. A

BOLIVAR O. CONVERSE, OF SPRINGFIELD, OHIO.

IMPROVEMENT IN THE MANUFACTURE OF M ETAL TUBING.

Specification forming part of Letters Patent No. 204,136, dated May 28,1878; application filed August 13, 1877. A

To all whom it may concern:

Be it known that I, BOLIVAR G. CONVERSE, of the city of Springfield, inthe county of Clarke and State of Ohio, have invented a Die or Tool andProcesses for Manufacturing anew article of Metal Tubing; and I herebydeclare that the following is a specification of the same, in which theconstruction of the die, the process of manufacture, and the product arefully set forth.

My invention will be fully understood by reference to the drawings, inwhich- Figure 1 is a view of the open or rear side of a die for drawingmy tubing. Fig. 2 is a vertical cross-section of the same through linea. Fig. 3 is a horizontal cross-section of the same through line y. Fig.4 is a view of the front or reverse side of the die A, through which thetubing is drawn; figs. 5 to 8, views illustrating different modes offorming the T-shaped strip or skelp. Fig. 9 shows a section of thefinished tubing G, an opening being left between its edges 0 0 itsentire length. a is the rib, and b the body, of the same; and Fig. 10 isa cross-section of the tube G.

The finished sections shown in Figs. 9 and 10 are narrow-ribbed forspecial purposes.

, The slot 1 in the die may be made of any depth required, as shown bythe dotted extension lines in Figs. 1 and 4.

The illustrations shown in Figs. 5, 6, 7, and 8 exhibit modifications ofthe stock-strip, as it is called, and the manner of bending and doublingthe same for the manufacture of the new article of open-rib tubing.

The dies A are constructed with the usual conical opening I), convergingtoward the front or exit side, the face of the opening being smooth andunbroken, and a core, a, supported on one side within the opening. Thisis provided with a deep forming groove or slot, 1, extending in depthpartially or wholly through it for forming an inner rib, a. (See Figs. 9and 10.

The web which supports the core is made thick or thin, according to thewidth required for the opening between the edges 0 c of the tube G. Thegroove 1 may extend in depth notonly through the core a, but alsothrough the web, and even into the body of the die,

as seen in the dotted lines, Fig. 4, according to the width required forthe rib a and the purposes for which the tubing may be used. I do not,therefore, confine myself to any particular or proportional depth forthe groove 1 in the die A in the fabrication of my tubing.

For small tubing for dash moldings, edgings, bindings, &c., for articlesof leather manufacture requiring a narrow rib, the groove 1 need notextend deeper than out in the die A, while in larger tubing forhand andstair rails it may extend to the depthshown in the dotted lines, Fig. 4.

In the manufacture of single-thickness tubing the strip B (shown in Fig.5) is first rolled out in an gle-rolls to the approximate size, and itsedges trimmed to the proper width, and then introduced into the die bybending down the edges 0 c as shown in the dotted lines, care beingtaken to direct the part d for forming the ribinto the groove 1. Thepieces shown in Figs. '6, 7, 8, made by bending a flat sheet of metal toform a strip having a T-shaped cross-section, are introduced in the samemanner, the parts 0 e d and f being drawn into the groove 1 to form therib.

I claim as my invention- 1. The within-described mode of making a tubehaving a central internal rib, the same consisting in forming a skelp ofa T-shaped cross-section, and then passing the same through a taperingdie having a core, a, with a central slot, 1, as set forth.

2. The within-described die, consisting of the block A, having anopening tapering uniformly from one face to the other of the block, anda short cylindrical slotted core, to, supported by a web having paralleledges, and extending centrally from the contracted end of the openir g,all as set forth. I

3. As a new article of manufacture, a tube the edges of which areseparated, and from which extends centrally toward the slot between saidedges a rib, as set forth.

BOLIVAR O. CONVERSE. [L. 8-]

